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/*
* Copyright 2016 - 2018 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class ObdDongleProtocolDecoder extends BaseProtocolDecoder {
public ObdDongleProtocolDecoder(ObdDongleProtocol protocol) {
super(protocol);
}
public static final int MSG_TYPE_CONNECT = 0x01;
public static final int MSG_TYPE_CONNACK = 0x02;
public static final int MSG_TYPE_PUBLISH = 0x03;
public static final int MSG_TYPE_PUBACK = 0x04;
public static final int MSG_TYPE_PINGREQ = 0x0C;
public static final int MSG_TYPE_PINGRESP = 0x0D;
public static final int MSG_TYPE_DISCONNECT = 0x0E;
private static void sendResponse(Channel channel, int type, int index, String imei, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(0x5555); // header
response.writeShort(index);
response.writeBytes(imei.getBytes(StandardCharsets.US_ASCII));
response.writeByte(type);
response.writeShort(content.readableBytes());
response.writeBytes(content);
content.release();
response.writeByte(0); // checksum
response.writeShort(0xAAAA);
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int index = buf.readUnsignedShort();
String imei = buf.readSlice(15).toString(StandardCharsets.US_ASCII);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // data length
if (type == MSG_TYPE_CONNECT) {
ByteBuf response = Unpooled.buffer();
response.writeByte(1);
response.writeShort(0);
response.writeInt(0);
sendResponse(channel, MSG_TYPE_CONNACK, index, imei, response);
} else if (type == MSG_TYPE_PUBLISH) {
int typeMajor = buf.readUnsignedByte();
int typeMinor = buf.readUnsignedByte();
buf.readUnsignedByte(); // event id
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedInt() * 1000));
int flags = buf.readUnsignedByte();
position.setValid(!BitUtil.check(flags, 6));
position.set(Position.KEY_SATELLITES, BitUtil.to(flags, 4));
double longitude = ((BitUtil.to(buf.readUnsignedShort(), 1) << 24) + buf.readUnsignedMedium()) * 0.00001;
position.setLongitude(BitUtil.check(flags, 5) ? longitude : -longitude);
double latitude = buf.readUnsignedMedium() * 0.00001;
position.setLatitude(BitUtil.check(flags, 4) ? latitude : -latitude);
int speedCourse = buf.readUnsignedMedium();
position.setSpeed(UnitsConverter.knotsFromMph(BitUtil.from(speedCourse, 10) * 0.1));
position.setCourse(BitUtil.to(speedCourse, 10));
ByteBuf response = Unpooled.buffer();
response.writeByte(typeMajor);
response.writeByte(typeMinor);
sendResponse(channel, MSG_TYPE_PUBACK, index, imei, response);
return position;
}
return null;
}
}
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